Is where I bought mine from. The owner is a member on wakeworld user name "atlmobiuslsv" name is chris. I bought the arc audio ks 600.2.
rated: 400x2 at 4ohm.
1200 x 1 4ohm bridged.
I was also looking for the ks 300 but opted for this amp for more power, its new to the ks line this year may be worth looking into if your in the same situation as me.